Recurrent abdominal abscess caused by retained colorectum after proctocolectomy

In two patients recurrent pelvic abscesses resulted from retention of colorectal mucosa after proctocolectomy. In both patients sepsis occurred more than 10 years after colectomy and was corrected by identification and removal of retained colonic mucosa. Retained colorectum should be considered in the differential diagnosis in a patient who has an abscess years after undergoing colon resection.